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American Association of Geographers Davis Excursion, St. Paul, Minn., 1912

American Association of Geographers Davis Excursion, St. Paul, Minn., 1912

President I. J. Griswold home, Winthrop, Iowa, late 1890s or early 1900s

President I. J. Griswold home, Winthrop, Iowa, late 1890s or early 1900s

Map of Iowa showing by density of pattern the relative resistances of various areas of rock to erosion, Iowa, late 1890s or early 1900s

Map of Iowa showing by density of pattern the relative resistances of various areas of rock to erosion, Iowa, late 1890s or early 1900s

Map of northeastern Iowa with dashed line showing locations of an old drift in patches east of margin of Kansan drift, Iowa, late 1890s or early 1900s

Map of northeastern Iowa with dashed line showing locations of an old drift in patches east of margin of Kansan drift, Iowa, late 1890s or early 1900s

Old Faithful,Yellowstone National Park, late 1890s or early 1900s

Old Faithful,Yellowstone National Park, late 1890s or early 1900s

Steam Laboratory

Steam Laboratory

University of Iowa Campus, Iowa City
Steam Laboratory

Steam Laboratory

University of Iowa Campus, Iowa City
Capitol City Brick and Pipe Company, Des Moines, Iowa, late 1890s or early 1900s

Capitol City Brick and Pipe Company, Des Moines, Iowa, late 1890s or early 1900s

School house, Humboldt, Iowa, late 1890s or early 1900s

School house, Humboldt, Iowa, late 1890s or early 1900s

Aftonian gravels, Muscatine County, Iowa, late 1890s or early 1900s

Aftonian gravels, Muscatine County, Iowa, late 1890s or early 1900s